Abstract
Effects of Mn content on warm stretch-flangeability are investigated using 0.2%C–1.5%Si–(1.5–5.0)% Mn transformation-induced plasticity (TRIP)-aided sheet steels with annealed martensite matrix. Warm hole-expansion at 150–250 °C after hole-punching at 25 °C enhances the stretch-flangeability of 3 and 5% Mn steels. The warm stretch-flangeability increases with the Mn content. The superior warm stretch-flangeability of hole-punched 5% Mn steel is caused by its large localized ductility on expanding, which results primarily from the stabilization of its large quantity of retained austenite and its fine microstructure. Use of hole-drilling instead of hole-punching at 25 °C further increases the stretch-flangeability and raises the optimum expanding temperature to 250–300 °C.
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